Guilty Gear XX #Reload

SP fighters:
Defeat an SP character in survival mode. Then, hold L when picking that fighter at the character selection screen to play as the SP version. Alternately, successfully complete 80 missions.
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EX fighters:
Defeat an EX character in survival mode, Then, hold White when choosing that fighter at the character selection screen to play as the EX version. Alternately, successfully complete 30 missions.

GGX and GGXX mode:
Successfully complete 70 missions.

Fight as Kliff:
Successfully complete 50 missions; or accumulate 72 hours of game time; or defeat Kliff in Survivor mode (level 440).
Nick Erice.

Fight as Justice:
Successfully complete 50 missions; or accumulate 72 hours of game time; or defeat Justice in Survivor mode (level 460).
Nick Erice.

Fight against gold fighters:
Highlight the "Arcade" or "M.O.M." mode options, then hold L while selecting it. You will fight against gold opponents in that mode.

Fight against EX fighters:
Highlight the "Arcade" or "M.O.M." mode options, then hold White while selecting it. You will fight against EX opponents in that mode.

Fight against gold EX fighters:
Highlight the "Arcade" or "M.O.M." mode options, then hold L + White while selecting it. You will fight against EX opponents in that mode.

Play as Gold and Black characters:
After unlocking the SP versions of any character, go to the character selection screen. Hold L and press Start (for Black) or R (for Gold). When you begin playing, the versions will retain their powers from mission mode (Infinite Tension for Black versions, and Mega Speed and Infinite Tension for Gold versions). Note: You can only play as Black and Gold Versions in training and arcade modes. Note: Gold version characters do not regain health. Also, Gold versions exhibit stronger powers and are much faster than normal characters. However, the speed only applies to some characters (for example, Sol-Badguy, Johnny). Some moves will not only look different, but can deliver more hit than their normal counterparts (for example, Ky's normal Stun Edge will deliver three hits when played as a Gold Character).
Damion Rohman.

Hint: Gold character advantages:
Some character will have special feature when they are gold. All characters will have increased speed, except Cliff.
Brig taylorX2.

Gold Sol: Will recover slowly, has unlimited tension and "Dragon Install". His moves will be be twice as strong.

Gold Ky: Only will have more powerful moves. His Stun Edge will hit three times and with HS (B), it will hit ten times.

Gold May: Will have more powerful atacks. The Dolphin Attack (Down, Forward + any non-kick button) will hit seven or more times.

Gold Jam: You do not need to use his special charge. It will use his Dragon and Phoenix Kick at the maximum force.

Gold Bridget: His "Bear Attack" will last longer. His attack power will also have a great increase.

Gold Johnny: His "Mist Finner" will instantly kill any normal, Ex, or black character, but leaves with a bit of energy to gold enemies. If you toss coins to the foes, it can do up to 999 damage (except for Ex Johnny).

Gold Venom: His ball launch attack will be at maximum force without charge. Also if you use his Pool Rain, all the balls you launch will be at medium force.

Gold Eddie (Zato-One): All his attacks will have more power.

Gold Slayer: Most of his attacks will have increased force. Also when you strike any enemy, you will recover energy by the amount you hit them with.

Gold Millia: His attacks will become stronger.

Gold Dizzy: It will have infinite Dark Cape (the same used in Ex). His Fire Scythe will do up to twelve hits. Also his Ice Monster attack covers from all.

Hint: Johnny: One-hit kill:
In arcade or training mode, select the Gold version of Johnny. When the fight begins, at any time use any version of Johnny's Mist Finer and the enemy will be instantly defeated. Do not use the EX version of Johnny because the catch version of Mist Finer will not one-hit kill your enemy.
Damion Rohman.

Hint: Johnny: Warp:
When playing as the Gold version of Johnny, perform the motion to run. Johnny will not run, but instead "warp" to the other side.
Damion Rohman.

Hint: Alliances in arcade mode:
When playing in arcade mode and on either GG or GGX mode, there are alliances to watch out for. Alliances are when two characters come after one another that are either friends or enemies in the Guilty Gear storyline.

Sol-Badguy to Ky-Kiske
Johnny to May
Anji to Baiken
Dizzy to Testament

Note: These can also work in the opposite direction (for example, Ky-Kiske to Sol-Badguy).
Damion Rohman.